tools/libxc: Move xc_version() out of xc_private.c into its own file

kexec-tools uses xc_version(), meaning that it is not a private API.  As we're
going to extend the functionality substantially, move it to its own file.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>

tools/libs/ctrl/Makefile.common

@@ -16,6 +16,7 @@ OBJS-y       += xc_pm.o
 OBJS-y       += xc_cpu_hotplug.o
 OBJS-y       += xc_vm_event.o
 OBJS-y       += xc_vmtrace.o
+OBJS-y       += xc_version.o
 OBJS-y       += xc_monitor.o
 OBJS-y       += xc_mem_paging.o
 OBJS-y       += xc_mem_access.o

tools/libs/ctrl/xc_private.c

@@ -490,72 +490,6 @@ int xc_sysctl(xc_interface *xch, struct xen_sysctl *sysctl)
     return do_sysctl(xch, sysctl);
 }
 
-int xc_version(xc_interface *xch, int cmd, void *arg)
-{
-    DECLARE_HYPERCALL_BOUNCE(arg, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT); /* Size unknown until cmd decoded */
-    size_t sz;
-    int rc;
-
-    switch ( cmd )
-    {
-    case XENVER_version:
-        sz = 0;
-        break;
-    case XENVER_extraversion:
-        sz = sizeof(xen_extraversion_t);
-        break;
-    case XENVER_compile_info:
-        sz = sizeof(xen_compile_info_t);
-        break;
-    case XENVER_capabilities:
-        sz = sizeof(xen_capabilities_info_t);
-        break;
-    case XENVER_changeset:
-        sz = sizeof(xen_changeset_info_t);
-        break;
-    case XENVER_platform_parameters:
-        sz = sizeof(xen_platform_parameters_t);
-        break;
-    case XENVER_get_features:
-        sz = sizeof(xen_feature_info_t);
-        break;
-    case XENVER_pagesize:
-        sz = 0;
-        break;
-    case XENVER_guest_handle:
-        sz = sizeof(xen_domain_handle_t);
-        break;
-    case XENVER_commandline:
-        sz = sizeof(xen_commandline_t);
-        break;
-    case XENVER_build_id:
-        {
-            xen_build_id_t *build_id = (xen_build_id_t *)arg;
-            sz = sizeof(*build_id) + build_id->len;
-            HYPERCALL_BOUNCE_SET_DIR(arg, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
-            break;
-        }
-    default:
-        ERROR("xc_version: unknown command %d\n", cmd);
-        return -EINVAL;
-    }
-
-    HYPERCALL_BOUNCE_SET_SIZE(arg, sz);
-
-    if ( (sz != 0) && xc_hypercall_bounce_pre(xch, arg) )
-    {
-        PERROR("Could not bounce buffer for version hypercall");
-        return -ENOMEM;
-    }
-
-    rc = do_xen_version(xch, cmd, HYPERCALL_BUFFER(arg));
-
-    if ( sz != 0 )
-        xc_hypercall_bounce_post(xch, arg);
-
-    return rc;
-}
-
 unsigned long xc_make_page_below_4G(
     xc_interface *xch, uint32_t domid, unsigned long mfn)
 {

tools/libs/ctrl/xc_private.h

@@ -210,13 +210,6 @@ void xc__hypercall_buffer_cache_release(xc_interface *xch);
  * Hypercall interfaces.
  */
 
-static inline int do_xen_version(xc_interface *xch, int cmd, xc_hypercall_buffer_t *dest)
-{
-    DECLARE_HYPERCALL_BUFFER_ARGUMENT(dest);
-    return xencall2(xch->xcall, __HYPERVISOR_xen_version,
-                    cmd, HYPERCALL_BUFFER_AS_ARG(dest));
-}
-
 static inline int do_physdev_op(xc_interface *xch, int cmd, void *op, size_t len)
 {
     int ret = -1;

tools/libs/ctrl/xc_version.c

@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ * xc_version.c
+ *
+ * Wrappers aound XENVER_* hypercalls
+ */
+
+#include "xc_private.h"
+#include <assert.h>
+
+static int do_xen_version(xc_interface *xch, int cmd,
+                          xc_hypercall_buffer_t *dest)
+{
+    DECLARE_HYPERCALL_BUFFER_ARGUMENT(dest);
+    return xencall2(xch->xcall, __HYPERVISOR_xen_version,
+                    cmd, HYPERCALL_BUFFER_AS_ARG(dest));
+}
+
+int xc_version(xc_interface *xch, int cmd, void *arg)
+{
+    DECLARE_HYPERCALL_BOUNCE(arg, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT); /* Size unknown until cmd decoded */
+    size_t sz;
+    int rc;
+
+    switch ( cmd )
+    {
+    case XENVER_version:
+        sz = 0;
+        break;
+    case XENVER_extraversion:
+        sz = sizeof(xen_extraversion_t);
+        break;
+    case XENVER_compile_info:
+        sz = sizeof(xen_compile_info_t);
+        break;
+    case XENVER_capabilities:
+        sz = sizeof(xen_capabilities_info_t);
+        break;
+    case XENVER_changeset:
+        sz = sizeof(xen_changeset_info_t);
+        break;
+    case XENVER_platform_parameters:
+        sz = sizeof(xen_platform_parameters_t);
+        break;
+    case XENVER_get_features:
+        sz = sizeof(xen_feature_info_t);
+        break;
+    case XENVER_pagesize:
+        sz = 0;
+        break;
+    case XENVER_guest_handle:
+        sz = sizeof(xen_domain_handle_t);
+        break;
+    case XENVER_commandline:
+        sz = sizeof(xen_commandline_t);
+        break;
+    case XENVER_build_id:
+        {
+            xen_build_id_t *build_id = (xen_build_id_t *)arg;
+            sz = sizeof(*build_id) + build_id->len;
+            HYPERCALL_BOUNCE_SET_DIR(arg, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+            break;
+        }
+    default:
+        ERROR("xc_version: unknown command %d\n", cmd);
+        return -EINVAL;
+    }
+
+    HYPERCALL_BOUNCE_SET_SIZE(arg, sz);
+
+    if ( (sz != 0) && xc_hypercall_bounce_pre(xch, arg) )
+    {
+        PERROR("Could not bounce buffer for version hypercall");
+        return -ENOMEM;
+    }
+
+    rc = do_xen_version(xch, cmd, HYPERCALL_BUFFER(arg));
+
+    if ( sz != 0 )
+        xc_hypercall_bounce_post(xch, arg);
+
+    return rc;
+}